# Conjuga

A Spanish-learning iOS app that combines verb conjugation practice, a full textbook reader, an AI conversation partner, offline dictionary lookups, grammar exercises, and more. Runs entirely on-device where possible (Foundation Models, Speech framework, Vision OCR).

## Features

### Verb practice
- **Six conjugation modes** — flashcards, typing, multiple choice, handwriting (Apple Pencil / finger), sentence builder, and full-table (conjugate all persons at once)
- **Focus modes** — weak verbs (SM-2 spaced repetition), irregularity drills (spelling / stem / unique), common tenses
- **1,750 verbs** across 5 levels (Basic → Expert) with 209 K pre-conjugated forms and 23 K irregular-span annotations
- **20 tenses** — every indicative, subjunctive, conditional, and imperative tense, each with character-level irregular highlighting
- **Irregularity filter** — search the verb list by Any Irregular / Spelling Change / Stem Change / Unique Irregular, combinable with level filter
- **Text-to-speech** on any form

### Content & study
- **Textbook reader** — 30 chapters of *Complete Spanish Step-by-Step* with 251 interactive exercises (keyboard + Apple Pencil), 931 OCR'd vocab tables rendered as Spanish→English grids (~3 100 paired cards extracted via bounding-box OCR)
- **Course decks** — weekly vocab decks with example sentences, week tests, and cumulative checkpoint exams
- **Stem-change toggle** on Week 4 flashcard decks (E-IE, E-I, O-UE, U-UE) showing inline present-tense conjugations
- **Grammar guide** — 20 tense guides with usage rules and examples + 20+ grammar topic notes (ser/estar, por/para, preterite/imperfect, etc.), each with 100+ practice exercises
- **Grammar exercises** — interactive quizzes for 5 core topics (ser/estar, por/para, preterite/imperfect, subjunctive, personal *a*)

### AI & speech
- **Conversational practice** — on-device AI chat partner (Apple Foundation Models) with 10 scenario types; chat bubbles have tappable words that open dictionary / on-demand AI lookup
- **AI short stories** — generated stories with tappable words and comprehension quizzes
- **Listening practice** — listen-and-type + pronunciation scoring via the Speech framework
- **Pronunciation check** — word-by-word match scoring

### Vocabulary & tools
- **Offline dictionary** — reverse index of 175 K verb forms + 200 common words, cached to disk for instant lookups
- **Vocab SRS review** — spaced repetition over course vocabulary with Again / Hard / Good / Easy rating
- **Cloze practice** — fill-in-the-blank sentences with distractor generation
- **Lyrics practice** — search, translate, and read Spanish song lyrics

### Tracking & sync
- **Progress** — streaks, daily goals, accuracy stats, achievement badges, study-time tracking per day
- **CloudKit sync** — review progress, test results, saved stories, conversations, and textbook attempts sync across devices
- **Widgets** — combined dashboard + word-of-the-day, refreshed daily and on backgrounding

## Architecture

- **SwiftUI** + **SwiftData** with a dual-store configuration:
  - **Local store** (App Group `group.com.conjuga.app`) — reference data: verbs, forms, irregular spans, tense guides, course decks, vocab cards, textbook chapters. Seeded from bundled JSON on first launch. Self-healing re-seeds trigger on version bumps *or* if rows are missing on disk.
  - **Cloud store** (CloudKit `iCloud.com.conjuga.app`, private database) — user data: review cards, course reviews, user progress, test results, daily logs, saved songs, stories, conversations, textbook exercise attempts.
- **SharedModels** Swift Package shared between the app and widget extension. Widget schema must include every local-store entity or SwiftData destructively migrates the shared store.
- **Foundation Models** for on-device AI generation (`@Generable` structs for typed output).
- **Vision** framework for OCR of textbook pages and vocabulary images.
- **Speech** framework for recognition and pronunciation scoring.
- **Textbook extraction pipeline** (`Conjuga/Scripts/textbook/`) — XHTML and answer-key parsers, macOS Vision image OCR + PDF page OCR, bounding-box vocab pair extractor, NSSpellChecker-based validator, and language-aware auto-fixer.

## Requirements

- iOS 18+ (iOS 26 for Foundation Models features)
- Xcode 16+

## Building

Open `Conjuga/Conjuga.xcodeproj` in Xcode and run on a simulator or device. Reference data seeds automatically on first launch. To regenerate textbook content, run `Conjuga/Scripts/textbook/run_pipeline.sh` locally — the generated `textbook_data.json` / `textbook_vocab.json` are committed so fresh clones build without the pipeline.